Simplify the expression sin a(csc a-sina)

a) 1-cos a
b) sin^a
c) 1
d) 1-sin a
e) cos^2 a

Suppose that in 2008 , 840,800 citizens died of a certain disease assuming the population of teh country is 399 miliion, what is the mortality rate in units of deaths per 100,000 people?